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diff --git a/History.md b/History.md
--- a/History.md
+++ b/History.md
@@ -11,6 +11,11 @@
===
## R02-0X-00
+22 May 2024 Fernando Abudinen
+* D118: Removed obsolete `ISR` attribute for photons. It was redundant as it was supposed to be
+ the contrary of the `FSR` attribute. It was never used and could lead to confusion.
+ - The `FSR` attribute is now set to 0 by default at initialisation for `EvtPhotonParticle`.
+
21 May 2024 Fernando Abudinen
* D115: Introduced Sherpa's PHOTONS++ generator
as alternative for final-state radiation simulation.
diff --git a/src/EvtGenBase/EvtPhotonParticle.cpp b/src/EvtGenBase/EvtPhotonParticle.cpp
--- a/src/EvtGenBase/EvtPhotonParticle.cpp
+++ b/src/EvtGenBase/EvtPhotonParticle.cpp
@@ -43,6 +43,7 @@
setpart_num( part_n );
setLifetime();
+ setAttribute( "FSR", 0 );
}
EvtVector4C EvtPhotonParticle::epsParentPhoton( int i ) const
diff --git a/src/EvtGenExternal/EvtPHOTOS.cpp b/src/EvtGenExternal/EvtPHOTOS.cpp
--- a/src/EvtGenExternal/EvtPHOTOS.cpp
+++ b/src/EvtGenExternal/EvtPHOTOS.cpp
@@ -213,7 +213,6 @@
gamma->setFSRP4toZero();
// Set its particle attribute to specify it is a FSR photon
gamma->setAttribute( "FSR", 1 ); // it is a FSR photon
- gamma->setAttribute( "ISR", 0 ); // it is not an ISR photon
// Let the mother know about this new photon
gamma->addDaug( theParticle );
}
diff --git a/src/EvtGenExternal/EvtSherpaPhotons.cpp b/src/EvtGenExternal/EvtSherpaPhotons.cpp
--- a/src/EvtGenExternal/EvtSherpaPhotons.cpp
+++ b/src/EvtGenExternal/EvtSherpaPhotons.cpp
@@ -287,7 +287,6 @@
gamma->init( m_gammaId, newP4 );
gamma->setFSRP4toZero();
gamma->setAttribute( "FSR", 1 );
- gamma->setAttribute( "ISR", 0 );
gamma->addDaug( theParticle );
}
}

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